Selective filter system



s 1934- 'A. M TROGNER SELECTIVE FILTER SYSTEM 2 SheetsSheet 1 Original Filed May 26, 1931 Arthur M. TIDHILBI a & M w

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SELECTIVE FILTER SYSTEM Original Filed May 26, 1931 2 Sheets-Sheet 2 m g "a NN 3 R s N] E :& v

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UNITED STATES PATENT OFFICE SELECTIVE FILTER SYSTEM Arthur M. Trogner, Maplewood, N. J assignor to Wired Radio, Inc., New York, N.'Y., a corporation of Delaware Original application May 26, 1931, Serial No. 540,035. Patent No. 1,894,645, dated January 17, 1933. Divided and this application April 14, 1932, Serial No. 605,171

6 Claims. (Cl. 200-) This is a division of my application Serial Numprovided with contacts 10, 11, and 12 as shown. her 540,035, filed May 26, 1931, entitled Selective Contacts 10 are connected to different values of filter system, now PatentNo.l,894,645,issuedJanthe inductance comprising auto-transformer 6. uary '17, 1933, and specifically relates to a switch- Contacts 11 are commonly connected to ground 5 ing arrangement for rendering a filter system and to the output terminal 4. Contacts 12 in selectively responsive to predetermined frequency switch '7 are respectively connected to capacibands. tances 13, 14, 15, and 16 which form a related In the co-pending application of Robert D. group of capacitance values. Contacts 12 of Duncan, Jr., Serial Number 495,823, filed Novemswitch 8 are respectively connected to capaci- 13 her 15, 1930, there isdiscloseda type of filter systanccs 1'7, 18, 19, and 20 which form a related 10 tem which can be made selectively responsive to group of capacitance values, and contacts 12 of different bands of frequencies by a switching switch 9 are respectively connected to capacimechanism which selects related values of circuit tances 21, 22, 23, and 24 which form another reccnstants. The switching system disclosed in this lated group of capacitance values.

1.3 co-pending application comprises a series of An inductance 25, connected to the auto-transl5 switches each of which is adapted to connect to former 6 and electromagnetically coupled to an any one of several predetermined values of coninductance 26, is connected to capacitances 13, stants of any single mesh of the series of meshes 1'7, and 21. An inductance 27, connected to incomprising the filter system. Such an arrangeductance 26 and electromagnetically coupled to 20 ment necessitates the movement of all switches inductance 28, is connected to the capacitances 20 to make the filter system responsive to a different 14, 18, and 22 An inductance 29, connected to frequency band. inductance 28 and electromagnetically coupled One of the objects of my invention consists in to inductance 30, is connected to capacitances 15, providing a selective filter system in which it is 19, and 23. One side of the inductance 30 is con- 25 necessary to move but one switch to change the nected to the capacitances 16, 20, and 24, while 25 constants of a series of meshes in a filter. the other side of the inductance is connected Another object consists in providing a selective through a terminating impedance 31 to contacts filter system having a series of switches each of 11 of the switches I, 8, and 9. The induetances which connects to related values of circuit con- 26 and 28 also have connections, as shown, to

30 stants in a multiplicity of filter meshes. ground. 30

A further object comprises producing a selective The inductance 25 forms a resonant circuit on filter system having simple mechanical means for combination with any one of the capacitances controlling the circuit constants of an electrical 13, 1'7, 01-21. The inductances 27 and 26, in comcircuit, bination with any one of the capacitances 14, 18,

'35 I accomplish the above desirable objects in a or 22, form another resonant circuit, while the 5 novel selective filter system employing a series of inductances 28 and 29 in combination with any rotatable switches under control of a reciprocative one of the inductances l5, 19, or 23 form another member. resonant circuit. The capacitances 16, 20, and

In the drawings which accompany and form a 24 provide different values of capacitances etpart of this specification and in which like reffective in combination with the inductance 30 40 erence characters designate corresponding parts and terminating impedance 31. This chain of throughout: resonant circuits, having the properly terminated Fig. 1 is a diagrammatic representation of the impedance 31, forms a filter system which is reselective filter system of my invention; sponsive to any one of a plurality of predeter- Fig. 2 is a top plan view of the switching mechamined frequency bands depending upon the 5 nism employed in my system; and values of capacitances selectedr Fig. 3 is a. transverse sectional view along the The switches 7, 8, and 9 are provided with rotor line 3-3 of Fig. 2. contacts 32 for making connection with the con- Referring to the drawings in detail, and partacts 10, 11, and 12. According to my invention ticularly to Fig. 1, input terminals 1 are conany one of the rotor contacts 32 canbe moved for 50 nected through coupling condensers 2 to a potenrendering the filter system, as a whole, selectively tiometer resistance 3. .The potentiometer reresponsive to a predetermined band of freesistance 3 is connected to an output terminal 4 and quencies. has an adjustable connection to an auto-trans- Fig. 2 is a view of the mechanical construction former 6. A plurality of switches 7, 8, and 9 are of the switching arrangement of my selective 55 filter system. Referring to Figs. 2 and 3, the rotor contacts 32 are mounted upon rotatable insulating members 33 mo mted upon pivots 34. The pivots 34 are secured to an insulating base member 35. The contacts 10, 11, and 12 are mounted upon the base member 35 for engagement with the rotor contacts 32.

Tension springs 36 are provided between the rotatable members 33 and pillars 37 for normally holding the rotatable members 32 in a position such that the rotor contacts are out of engagement with the contacts 10, 11, and 12. A bar 38 is reciprocatively mounted in two bearing members 39 and 40 in a position above the rotatable members 33. A knob 41 rotatably mounted in bearing member 42 is provided with an arm 43 which has a slot therein for engagement with a pin 44 mounted in the bar 38. The arm 43 terminates in a pointer 45 for indicating the position of the bar 38 with reference to designations "A. E, and C on an index sector 46.

The bar 38 is provided with projecting portions 4'7, 48. and 49 for engagement with pins mounted in the rotatable members 33 of switches 9. 8, and 7. The projections 47, 48, and 49 are so situated along the bar 38 that longitudinal movement of the bar 38 will cause sequential engagement of the projections 47, 48, and 49, with the pins 50 of the switches 7, 8, and 9. That is, when a is moved to a position such that the 45 is opposite the designation A, the pro ting portions 47 will be moved into engagement with pin 50 of switch 9 so that the rotatable member 33 is rotated cause the rotor contact 32 thereof to engage with the contacts 10, 11, and 12. Movement of the pointer 45 to the designation B will cause the projecting portion 48 to engage pin 50 of switch 8 thereby moving rotatable member 33 to cause the rotor contact 32 mounted thereon to engage with contacts 10, 11, and 12. At the same time, the projecting portion 47 will be moved out of engagement with pin 50 thereby permitting tension spring 36 to return the rotatable member 33 of switch 9 to a normal position wherein the rotor contact 32 is out of engagement with the contacts 10, 11, and 12. The pointer 45 can be further moved to designation C whereby the projection 49 will engage with pin 50 to cause rotatable member 33 of switch 7 to move the contact sector into engagement with the contacts 10, 11, and 12. Movement of the pointer 45 in a reverse direction will cause the switches 7, 3, and 9 to be actuated one at a time in reverse order. Each of the switches 7, 8, and 9 is adapted to respectively control the groups of circuit constants of the filter system cooperating to make the filter system responsive to a predetermined band of frequencies. The bar 38 is adapted to sequentially operate these switches by reciprocative motion.

It will be evident that the selective filter sys* tem of my invention provides an eiiicient and practical method of switching which is very adaptable to manufacturing purposes such as in the construction of wired radio receivers employing selective filter systems coupled to power lines carrying program modulated high frequency energy at a plurality of different carrier frequencies. Although I have shown a preferred embodiment of my invention, I do not wish to be limited thereto except insofar as may be pointed out in the appended claims.

What I claim as new and original and desire to secure by Letters Patent of the United States is:

1. The combination of an electrical organization, a plurality of switches for controlling said electrical organization, said switches each comprising a plurality of individual contacts and a single contact common to said individual contacts, a reciprocative bar member having projections thereon for sequentially engaging with said single contacts to impart rotary motion thereto and angularly movable means for longitudinally moving said bar member to rotate said single contacts to simultaneously engage all of the individual contacts of each of said switches in a predetermined sequence.

2. The combination of an electrical organization, a plurality of switches for controlling said organization, each of said switches comprising a plurality of individual contacts having a single contact common to said individual contacts, a reciprooative bar having means thereon for sequentially engaging with said single contacts to impart rotary motion thereto, and means for longitudinally moving said bar to rotate said single contacts to simultaneously engage all of the individual contacts of each of said switches in a predetermined sequence.

3. The combination of an electrical organization, a plurality of switches for controlling said electrical organization, said switches each comprising a plurality of radially disposed individual contacts and a single rotatable contact therefor, a reciprocative bar member having projections thereon for sequentially engaging with said single contacts to impart rotary motion thereto and angularly movable means for longitudinally moving said bar to rotate said single contacts to simultaneously engage all of the individual contacts of each of said switches in a predetermined sequence.

4. The combination of an electrical organization, a plurality of switches for controlling said organization, said switches each comprising a plurality of radially disposed individual contacts and a single rotatable contact therefor, a reciprocative bar having means thereon for sequentially engaging with said single contacts to impart rotary motion thereto and means for longitudinally moving said bar to rotate said single contacts to simultaneously engage all of the individual contacts of each of said switches in a predetermined sequence.

5. The combination of an electrical organization, a plurality of switches controlling said electrical organization, each of said switches com prising a plurality of individual contacts and a single contact common to said individual contacts, and means for operating said single contacts sequentially to simultaneously engage all of the individual contacts in each of said switches in a predetermined sequence.

6. The combination of an electrical organization, a plurality of switches for controlling said organization, each of said switches comprising a plurality of radially disposed individual contacts and a single rotatable contact therefor and means for rotating said single contacts sequentially to simultaneously engage all of the individual contacts of each of said switches in a predetermined sequence.

ARTHUR M. TROGNER. 

